Prevent Memory Leaks in Your App

Along with the search filter, I built a simple notes app. The idea was straightforward: type something → save it → keep it even after refresh. It mainly involved: • capturing user input • updating the UI dynamically • storing data in localStorage • retrieving it back on reload Nothing complex, but it tied together multiple concepts in a practical way. Seeing data persist made the whole flow feel closer to a real application. #javascript #webdevelopment #frontend

🚀 **Built a Live Character Counter App** Recently, I worked on a small project — a **Live Character Counter App** — to strengthen my JavaScript fundamentals. Through this project, I practiced: * String methods like `trim()` and `replace()` * Array method `filter()` for accurate word counting * Conditional logic * DOM manipulation * Event handling (especially `input` events) The app tracks: ✔ Character count ✔ Word count ✔ Remaining characters ✔ Live input feedback This project helped me understand how to handle edge cases like extra spaces and improve user experience with real-time updates. 💡 Small projects like this build a strong foundation for real-world applications. 🔗Live preview:- https://lnkd.in/gGVaUv9G If you have any suggestions or ideas for improvement, I’d really appreciate your feedback in the comments 🙌 #JavaScript #WebDevelopment #FrontendDevelopment #CodingJourney #100DaysOfCode

💡 How would you design a real-time notifications system in a frontend app? Here’s a practical approach I like to follow. I separate communication into two layers: 🔹 REST APIs for CRUD operations 🔹 WebSockets for real-time updates On the frontend, I create a WebSocket service that: • Maintains the connection • Handles reconnection logic • Parses incoming messages To keep things scalable and decoupled, I use a pub/sub (event-based) system. Components subscribe to specific notification types, so updates flow efficiently without tight coupling. For state management, notifications live in a centralized store or data-fetching layer—ensuring consistency across the app. ⚡ Performance matters: • Batch updates when needed • Avoid unnecessary re-renders (memoization) • Limit rendered items (virtualization or pagination) And of course, don’t forget the edge cases: 🔸 Connection loss 🔸 Duplicate messages 🔸 Message ordering Clean architecture + resilience = a smooth real-time experience. How would you approach this? #FrontendDevelopment #WebDevelopment #SoftwareArchitecture #RealTimeSystems #WebSockets #JavaScript #ReactJS #SystemDesign #Programming #TechEngineering

The app didn’t crash. It just got slower… over time. --- While testing a feature, everything looked fine: Initial load was fast API responses were quick UI felt smooth --- But after using the app for a while: It started lagging Interactions became slow Memory usage kept increasing --- No errors. No crashes. Just… gradual slowdown. --- That’s when I realized: 👉 This wasn’t a performance issue. 👉 It was a memory leak. --- The mistake? We were: Not cleaning up event listeners Keeping unused state in memory Letting components hold data longer than needed --- 💡 The fix: Proper cleanup in useEffect Removed unnecessary state Ensured components release memory when unmounted --- Result: Stable performance over time No gradual slowdown Better user experience --- The insight: ❌ “App works fine” ✅ “App works fine over time” --- Most bugs don’t appear instantly. 👉 They show up after continuous usage. --- Now I always ask: What happens after 10 minutes of use? Is anything staying in memory unnecessarily? Are we cleaning up properly? --- Performance is not just about speed. 👉 It’s about consistency over time. --- Have you ever faced an issue that only appeared after using the app for a while? #softwareengineering #debugging #performanceoptimization #reactjs #webdevelopment #fullstackdeveloper #codingtips #devcommunity #programminglife JavaScript Mastery w3schools.com NamasteDev.com Akshay Saini 🚀

🧵 Day 8 of 40 — React System Design Series I needed to add a loading spinner in a Redux app. It took me 2 hours. 5 files. Constants. Action creators. Reducer cases. Selectors. For a boolean. That was old Redux. Redux Toolkit fixed it. Today I broke down: → Why old Redux was so painful (and why the rules existed) → createSlice — actions + reducer in one place, Immer built-in → createAsyncThunk — pending/fulfilled/rejected for free → The folder structure that scales to large teams → Redux Toolkit vs Zustand — the honest comparison Full breakdown with real TypeScript code 👇 https://lnkd.in/dBA2mM8y #ReactJS #SystemDesign #Frontend #LearningInPublic #WebDevelopment

🚀 REDUX — Manage State. Simplify Complexity. State management can become messy as applications grow. That’s where Redux helps by providing a predictable and centralized way to manage your app’s state. 💡 What is Redux? Redux is a state management library for JavaScript applications (commonly used with React). Think of it as a single source of truth (store) for your entire app. ⚙️ How Redux Works: 1️⃣ Store → Holds the complete state 2️⃣ Actions → Describe what happened 3️⃣ Reducers → Decide how state changes 4️⃣ Dispatch → Sends actions to update state 📌 Example Flow: User logs in → Action dispatched → Reducer updates state → UI updates automatically 🔥 Why use Redux? ✔️ Predictable state management ✔️ Easier debugging ✔️ Scales for large applications ✔️ Cleaner architecture 💡 Pro Tip: Use Redux Toolkit to reduce boilerplate and speed up development. 💬 I love discussing React, Redux, and frontend best practices. Let’s connect and grow together! #Redux #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #ReduxToolkit #SoftwareDeveloper #Learning #Tech

Day [9] of learning Code for Change When I started learning Next.js, I thought loading states were just about showing a spinner. Turns out, it’s way more powerful than that. Here’s what I learned about loading.js in the App Router: → You can create a loading.js file inside a route folder → It automatically shows a fallback UI while the page is loading → No need to manually manage loading state with useState/useEffect That means cleaner code + better user experience. Example: If your folder looks like this: app/dashboard/page.js app/dashboard/loading.js Then Next.js will automatically show loading.js while page.js is fetching data. Why this is useful: Users don’t stare at a blank screen Your app feels faster (even if data takes time) Less boilerplate code Still exploring more about streaming and Suspense in Next.js that’s where things get really interesting #NextJS #WebDevelopment #Frontend #JavaScript #LearningInPublic

Handling a single Promise is easy. Handling multiple Promises correctly is where things get interesting. In real-world apps, we often need to: • Wait for everything to complete • Pick the first successful result • React to the fastest response • Or simply collect all outcomes That’s exactly what Promise combinators solve. In my latest blog, I’ve explained: • Promise.all • Promise.any • Promise.race • Promise.allSettled Using a simple and relatable wedding planning analogy 💍 The goal was simple — make async logic feel intuitive, not intimidating. If you’ve ever been confused about these methods, this will help. Read here 👇 https://lnkd.in/gtcRWS5E Would love your feedback! #JavaScript #WebDevelopment #AsyncProgramming #Frontend

⚔️ Zustand vs Redux Toolkit — the debate every React team has. Here’s how I think about it 👇 🟢 ZUSTAND — use it when: • Small → mid-sized app • You want minimal boilerplate • Simple store, fast setup • Solo dev or small team const useStore = create((set) => ({ count: 0, increment: () => set(state => ({ count: state.count + 1 })) })); 🔵 REDUX TOOLKIT — use it when: • Large team with strict conventions • You need time-travel debugging • Complex async flows (RTK Query, thunks, sagas) • Strong DevTools + audit trail matters ⚖️ Reality check: Both are excellent tools 👉 The real question: What fits your team’s context? 🚀 If you're starting fresh in 2026: Zustand (client state) React Query (server state) 👉 Covers ~80% of apps with minimal complexity 📌 Final thought: Redux isn’t “bad” …it’s just often overkill 💬 What does your current stack use? #ReactJS #Redux #Zustand #StateManagement